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North Korea's claims it has tested a hydrogen bomb will be top of the agenda as Britain's Foreign and Defence Secretaries meet their counterparts in Japan.
The discussions come after Kim Jong-un's secretive state said it successfully tested a miniaturised hydrogen bomb, a move that has caused alarm in the west.
The Foreign Office says Philip Hammond will discuss global security challenges with Japanese foreign minister Fumio Kishida alongside Michael Fallon and his opposite number Gen Nakatani.
The Foreign Secretary, who has arrived in the country after visits to China and the Philippines, will also meet Japanese Prime Minister Shinzo Abe. The FCO says he will reaffirm Britain's commitment to working together to uphold the rules-based international system.
Speaking after urgent discussions about North Korea in recent days with Chinese and South Korean foreign ministers, Mr Hammond said: "The UK and Japan are close allies.
"We enjoy a strong, historic relationship, based on common values and support for democracy, the rule of law, human rights and open markets.
"The long-term security of both the UK and Japan depend on upholding a stable international system. We will continue to work closely together to contribute to global prosperity, peace and security.
"The world today is increasingly dangerous, complex and uncertain.
"We face growing threats from terrorism and extremism, a resurgence in state-based threats including nuclear proliferation, and an escalation in challenges to our cyber security and to the rules-based international order.
"It is more important than ever for the UK to work with allies like Japan to counter these threats.
"As a permanent member of the UN Security Council, the UK is continuing to play a central role on the issues that matter and is working with allies like Japan to safeguard national security, as well as building our prosperity overseas."
Besides his top-level talks with the Japanese government on the H-bomb and other international issues, the Foreign Secretary will also visit Nissan HQ, Hitachi and the Japan Bank for International Cooperation (JBIC).